Vulnocalypse
Back to feed
44impact

Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2

Apache Log4j · CVE-2021-4104
0 news outlets0 CERTs and agencies0 researchers

What is it?

JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
7.5
EPSS
80.6%
First seen
7 d ago
Status
corroborated

All Apache vulnerabilities